Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

840DF8

ICAO 24-bit transponder address · allocated to Japan

Currently assigned to JA03WJ · AIRBUS A-350-1000

Hex
840DF8
Octal
41006770
Decimal
8,654,328
Country
JP
Tail
JA03WJ
Type
A35K
Broadcasting now · callsign JAL4 · 3,400 ft
Flights observed
132
Distinct callsigns
16
Country
JP
Last broadcast
3h ago

Current position

840DF8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 840DF8 falls within the block assigned to Japan (JP) by ICAO Annex 10, Volume III. Every aircraft registered in Japan receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 16 distinct

Callsign Airline Flights Last seen
JAL3 - 13 2026-07-12
JAL44 - 12 2026-06-27
JAL4 - 12 2026-07-11
JAL12 - 12 2026-07-05
JAL5 - 11 2026-07-13
JAL43 - 11 2026-06-27
JAL6 - 10 2026-07-13
JAL16 Japan Airlines 10 2026-07-06
JAL15 - 10 2026-07-06
JAL11 - 10 2026-07-05
JAL46 - 8 2026-07-02
JAL45 Japan Airlines 8 2026-07-02
JAL8191 - 2 2026-06-15
JAL44D Japan Airlines 1 2026-06-16
JAL3D Japan Airlines 1 2026-06-02
JAL11D Japan Airlines 1 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JAL5 - Jul 13, 17:55 UTCJul 14, 07:15 UTC13h 20m
2026-07-13 JAL6 HND → JFK Jul 13, 02:40 UTCJul 13, 14:45 UTC12h 5m
2026-07-12 JAL3 JFK → HND Jul 12, 05:55 UTCJul 12, 19:01 UTC13h 5m
2026-07-11 JAL4 HND → JFK Jul 11, 10:55 UTCJul 11, 23:25 UTC12h 30m
2026-07-10 JAL5 JFK → HND Jul 10, 17:55 UTCJul 11, 06:50 UTC12h 55m
2026-07-10 JAL6 HND → JFK Jul 10, 02:25 UTCJul 10, 14:50 UTC12h 25m
2026-07-08 JAL5 - Jul 8, 17:55 UTCJul 9, 06:45 UTC12h 50m
2026-07-08 JAL6 HND → JFK Jul 8, 02:25 UTCJul 8, 14:25 UTC12h 0m
2026-07-06 JAL15 - Jul 6, 21:50 UTCJul 7, 08:25 UTC10h 35m
2026-07-06 JAL16 HND → LAX Jul 6, 09:05 UTCJul 6, 18:25 UTC9h 20m
2026-07-05 JAL11 DFW → HND Jul 5, 17:30 UTCJul 6, 06:35 UTC13h 5m
2026-07-05 JAL12 HND → DFW Jul 5, 02:15 UTCJul 5, 13:20 UTC11h 5m
2026-07-04 JAL3 JFK → HND Jul 4, 06:00 UTCJul 4, 18:45 UTC12h 45m
2026-07-03 JAL4 HND → JFK Jul 3, 10:55 UTCJul 3, 23:10 UTC12h 15m
2026-07-02 JAL46 - Jul 2, 18:55 UTCJul 3, 07:30 UTC12h 35m
2026-07-02 JAL45 HND → CDG Jul 2, 01:45 UTCJul 2, 15:30 UTC13h 45m
2026-06-30 JAL46 - Jun 30, 19:25 UTCJul 1, 08:10 UTC12h 45m
2026-06-30 JAL45 HND → CDG Jun 30, 02:10 UTCJun 30, 15:50 UTC13h 40m
2026-06-29 JAL3 - Jun 29, 05:54 UTCJun 29, 18:55 UTC13h 0m
2026-06-28 JAL4 HND → JFK Jun 28, 11:14 UTCJun 28, 23:25 UTC12h 10m
2026-06-27 JAL44 - Jun 27, 19:00 UTCJun 28, 07:40 UTC12h 40m
2026-06-27 JAL43 HND → LHR Jun 27, 01:15 UTCJun 27, 14:39 UTC13h 25m
2026-06-25 JAL15 - Jun 25, 21:10 UTCJun 26, 08:30 UTC11h 20m
2026-06-25 JAL16 HND → LAX Jun 25, 09:05 UTCJun 25, 18:15 UTC9h 10m
2026-06-24 JAL11 DFW → HND Jun 24, 17:25 UTCJun 25, 06:00 UTC12h 35m
2026-06-24 JAL12 HND → DFW Jun 24, 02:34 UTCJun 24, 13:10 UTC10h 35m
2026-06-22 JAL46 - Jun 22, 18:54 UTCJun 23, 07:35 UTC12h 40m
2026-06-22 JAL45 HND → CDG Jun 22, 01:55 UTCJun 22, 15:45 UTC13h 50m
2026-06-20 JAL15 - Jun 20, 21:25 UTCJun 21, 08:15 UTC10h 50m
2026-06-20 JAL16 HND → LAX Jun 20, 09:14 UTCJun 20, 17:59 UTC8h 45m
2026-06-19 JAL11 DFW → HND Jun 19, 18:05 UTCJun 20, 06:29 UTC12h 25m
2026-06-19 JAL12 HND → DFW Jun 19, 02:14 UTCJun 19, 13:54 UTC11h 40m
2026-06-18 JAL5 - Jun 18, 08:25 UTCJun 18, 09:10 UTC45m
2026-06-17 JAL5 - Jun 17, 20:10 UTCJun 18, 03:20 UTC7h 10m
2026-06-17 JAL6 HND → JFK Jun 17, 02:35 UTCJun 17, 14:45 UTC12h 10m
2026-06-16 JAL44D LHR → HND Jun 16, 08:39 UTCJun 16, 21:30 UTC12h 51m
2026-06-15 JAL43 KEF → LHR Jun 15, 18:40 UTCJun 15, 20:54 UTC2h 15m
2026-06-15 JAL8191 - Jun 15, 13:40 UTCJun 15, 14:00 UTC20m
2026-06-15 JAL8191 - Jun 15, 02:50 UTCJun 15, 09:00 UTC6h 10m
2026-06-13 JAL5 JFK → HND Jun 13, 18:25 UTCJun 14, 07:05 UTC12h 41m
2026-06-13 JAL6 HND → JFK Jun 13, 02:35 UTCJun 13, 14:35 UTC11h 59m
2026-06-11 JAL15 - Jun 11, 21:10 UTCJun 12, 08:50 UTC11h 41m
2026-06-11 JAL16 HND → LAX Jun 11, 09:25 UTCJun 11, 18:20 UTC8h 55m
2026-06-10 JAL11 DFW → HND Jun 10, 17:30 UTCJun 11, 06:15 UTC12h 45m
2026-06-10 JAL12 HND → DFW Jun 10, 02:10 UTCJun 10, 12:40 UTC10h 30m
2026-06-08 JAL46 CDG → HND Jun 8, 19:25 UTCJun 9, 08:00 UTC12h 35m
2026-06-08 JAL45 HND → CDG Jun 8, 01:55 UTCJun 8, 15:55 UTC14h 0m
2026-06-06 JAL46 CDG → HND Jun 6, 18:59 UTCJun 7, 07:25 UTC12h 25m
2026-06-06 JAL45 HND → CDG Jun 6, 02:05 UTCJun 6, 16:20 UTC14h 15m
2026-06-05 JAL15 LAX → HND Jun 5, 03:40 UTCJun 5, 14:30 UTC10h 50m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the JA03WJ page for operator, model, and routing details .

Mode-S 840DF8 frequently asked

What is Mode-S code 840DF8?
840DF8 is an ICAO 24-bit transponder address. Allocated to Japan. Assigned to JA03WJ.
Where is Mode-S 840DF8 registered?
Mode-S code 840DF8 is allocated to Japan (JP). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 840DF8 broadcasting right now?
Yes. Mode-S 840DF8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 840DF8, octal 41006770, decimal 8,654,328.
What flights does 840DF8 operate?
Mode-S 840DF8 has broadcast 16 distinct callsigns, including JAL3, JAL44, JAL4, JAL12, JAL5.